Recursive out of stack from FileBackedHttpProvider

I am seeing this on a development build of DS taken from mainline (everything). I need to do some further analysis but right now I have too many other balls in the air.

The affected are no, a priori, associated with any changes I made.

Note that this is NOT VISIBLE IN ANY REALEASED version and the identical configuration did work on a release version.

Stack segment:

java.lang.StackOverflowError
java.lang.Exception.<init>(Unknown Source)
java.io.IOException.<init>(Unknown Source)
java.io.InterruptedIOException.<init>(Unknown Source)
java.net.SocketTimeoutException.<init>(Unknown Source)
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(Unknown Source)
com.sun.net.ssl.internal.ssl.InputRecord.readFully(Unknown Source)
com.sun.net.ssl.internal.ssl.InputRecord.read(Unknown Source)
com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(Unknown Source)
com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
java.io.BufferedInputStream.fill(Unknown Source)
java.io.BufferedInputStream.read(Unknown Source)
org.apache.commons.httpclient.HttpConnection.isStale(HttpConnection.java:506)
org.apache.commons.httpclient.HttpConnection.closeIfStale(HttpConnection.java:431)
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:382)
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
org.opensaml.saml2.metadata.provider.HTTPMetadataProvider.fetchMetadata(HTTPMetadataProvider.java:277)
org.opensaml.saml2.metadata.provider.FileBackedHTTPMetadataProvider.fetchMetadata(FileBackedHTTPMetadataProvider.java:99)
org.opensaml.saml2.metadata.provider.HTTPMetadataProvider.refreshMetadata(HTTPMetadataProvider.java:231)
org.opensaml.saml2.metadata.provider.HTTPMetadataProvider.getMetadata(HTTPMetadataProvider.java:201)
edu.internet2.middleware.shibboleth.wayf.IdPSiteSet.onEvent(IdPSiteSet.java:458)
org.opensaml.saml2.metadata.provider.AbstractObservableMetadataProvider.emitChangeEvent(AbstractObservableMetadataProvider.java:53)
org.opensaml.saml2.metadata.provider.HTTPMetadataProvider.refreshMetadata(HTTPMetadataProvider.java:246)
org.opensaml.saml2.metadata.provider.HTTPMetadataProvider.getMetadata(HTTPMetadataProvider.java:201)

Config segment:

<MetadataProvider
displayName="Lukas"
identifier="Lukas"
type="edu.internet2.middleware.shibboleth.metadata.provider.XMLMetadata"
backingFile="/Program Files/DsJSON/metadata/lukas"
url="https://dieng.switch.ch/i2ds/metadata.dieng.xml" />